CN203446031U - System capable of detecting and positioning radio exam cheating digital message signal - Google Patents
System capable of detecting and positioning radio exam cheating digital message signal Download PDFInfo
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- CN203446031U CN203446031U CN201320550522.XU CN201320550522U CN203446031U CN 203446031 U CN203446031 U CN 203446031U CN 201320550522 U CN201320550522 U CN 201320550522U CN 203446031 U CN203446031 U CN 203446031U
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Abstract
The utility model discloses a system capable of detecting and positioning a radio exam cheating digital message signal. The system comprises at least three positioning machines and a positioning processing machine. The three positioning machines and the positioning processing machine are in wireless communication connection. The positioning processing machine comprises a main controller, a local memory, a monitoring antenna, a monitoring receiver, an A/D and digital signal processing board, a GPS positioning receiver and a wireless communication server. The system provided by the utility model is capable of detecting, finding and accurately identifying the exam cheating radio digital message signal in real time, rapidly positions an emission source, can effectively block the normal communication of a variety of exam cheating radio signals, prevents cheating, and provides position information for relevant departments to catch cheating criminals.
Description
Technical field
The utility model relates to a kind of radio detection equipment, relate in particular to a kind of can detecting and the cheat at one's exam system of numeric messaging signal of positioned radio electricity.
Background technology
Nowadays, cheat at one's exam and formed one " industrial chain ": lawless person collects client, mail-order is to their receiving equipment; Employ examinee to utilize the pin hole picture pick-up device of camouflage, examination paper are spread out of to examination hall, " gunman " inscribes outside the venue, and adopts radio voice broadcast service or numeric messaging transmission technology means that answer is offered to the examinee in examination hall.This conduct has seriously destroyed fair, just examination principle, has seriously damaged and has observed disciplines and obey laws and outstanding student's interests, has destroyed social fairness mechanism.To this, radio monitoring department adopts technological means to preventing cheating enforcement to obtain significant effect, cheating examinee has been obtained to certain deterrent effect, but examination hall disperses and amount is large, equipment and the personnel of radio monitoring department are limited, in addition have again the Social Responsibility of self, examination hall discipline cannot only rely on radio monitoring department to maintain, so examination hall cheating still remains incessant after repeated prohibition.
At present, two kinds of technological means of the main employing of examination radio cheating: a kind of is to adopt the voice signal of FM modulation to carry out answer transmission, and another kind is that examination answer content is modulated by digital signal modulation mode, and transmits with short message mode.For the first fraudulent means, because the transmission time of cheating radio transmission signal is long, adopt FM modulation signal to be easy to separate the judgement of mediation audio monitoring, the radio control personnel of specialty utilize conventional monitoring jamming equipment to detect and find and disturbance suppression, for the second fraudulent means, because the existing jamming equipment of radio control department only has single interference signal emission function, need to disturb targetedly transmitting by information being passed to jamming equipment by networking again after other monitoring equipment scanning discovery interference signal, it is effective poor that this just causes the disposal of cheating signal, effective compacting of the FM voice biography topic signal of transmission (as traditional intercom biography topic) in the time of can only realizing length, can not realize the examination paper answer note of 2-3 second launch time is carried out disturbing in time blocking-up, and when adopting the second cheating mode, examination paper only needs several the notes just can end of transmission within the several seconds, about 2-3 of each note transmission time second.If do not adopted intelligentized detecting and interlock jamming equipment, cannot find and disturb, break through cheating signal.
Current, adopt digital signal technique to realize technical way and developing direction that the transmission of cheating signal has become radio cheating.The signal transmission time of wireless short message transmitter is very short, as sends note the shortest consuming time less than 2 seconds of 25 characters, sends 3 seconds the shortest consuming time of note of 100 characters, sends 4 seconds the shortest consuming time of note of 200 characters.
The existing equipment of radio control department is due to very low to the monitoring sweep speed of cheating radio signal, can only detect the FM voice biography topic signal (as traditional intercom biography topic) of catching long time transmission, can not reach without omitting to catch and be short to the 2-3 cheating of the numeric messaging in short-term signal of second launch time; In addition, the direction finding technology to cheating signal adopting is now correlation interference direction-finding technology or amplitude-comprised direction-finding technology, the above direction-finder sets of two of correlation interference direction-finding Technology Needs are by direction finding and cross and could realize location, and system is more complicated and cost is very high, is difficult to all-round popularization and applies; And amplitude-comprised direction-finding speed is slow, be also difficult to the direction finding location of the suitable signal of practising fraud in short-term.
Utility model content
The purpose of this utility model is fast with regard to being to provide a kind of monitoring sweep speed in order to address the above problem, and locates fast detecting and the cheat at one's exam system of numeric messaging signal of positioned radio electricity of its source position.
The utility model is achieved through the following technical solutions above-mentioned purpose:
The utility model comprises at least three localization machine and localization process machine, three described localization machine are connected by wireless telecommunications with described localization process machine, described localization process machine comprises master controller, local storage, monitoring aerial, monitoring receiver, A/D and digital signal panel, GPS location receiver and wireless communication server, the output of described monitoring aerial is connected with the input of described monitoring receiver, the output of described monitoring receiver is connected with the input of described A/D and digital signal panel, the data output end of described A/D and digital signal panel is connected with the data input pin of described master controller, the FPDP of described local storage is connected with the FPDP of described master controller, the output of described master controller is connected with the input of portable aobvious control terminal, the output of described GPS location receiver is connected with the input of described master controller, described master controller is connected with described wireless communication server.
Further, described localization machine is identical with the hardware configuration of described localization process machine.
As preferably, described monitoring aerial is dish cone reception antenna.
Particularly, described wireless communication server is 3G wireless router.
The beneficial effects of the utility model are:
The radio transmissioning signal of practising fraud in examination hall be found and accurately be identified to the utility model can by detecting real-time, and monitoring sweep speed high (more than 10GHz/s), detect first discovery time short (in 100 milliseconds), from finding that cheating signal is to completing positioning time short (in 2 seconds), really realized comprising the cheat at one's exam detecting real-time of signal of the multiple radio of numeric messaging signal (the shortest cheating note signal transmission duration 2-3 second), rapid analysis identification and location, can effectively block the proper communication of the multiple radio signal that cheats at one's exam, stop the generation of cheating, Bing Wei relevant department arrests cheating offender positional information is provided.
Accompanying drawing explanation
Fig. 1 is system flow schematic diagram of the present utility model;
Fig. 2 is described localization machine of the present utility model or described localization process machine hardware configuration schematic diagram;
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in further detail:
As shown in Figure 1, the utility model comprises at least three localization machine and localization process machine, three described localization machine are connected with the wireless telecommunications of described localization process machine, described localization process machine comprises master controller, local storage, monitoring aerial, monitoring receiver, GPS location receiver, A/D and digital signal panel and wireless communication server, the output of described monitoring aerial is connected with the input of described monitoring receiver, the output of described monitoring receiver is connected with the input of described A/D and digital signal panel, the data output end of described A/D and digital signal panel is connected with the data input pin of described master controller, the FPDP of described local storage is connected with the FPDP of described master controller, the output of described master controller is connected with the input of portable aobvious control terminal, the output of described GPS location receiver is connected with the input of described master controller, described master controller is connected with described wireless communication server.
Described localization machine is identical with the hardware configuration of described localization process machine, and described monitoring aerial is dish cone reception antenna, and described wireless communication server is 3G wireless router.
Operation principle of the present utility model is as follows: the utility model consists of three localization machine and 1 Monitoring and Positioning processor, three localization machine are arranged in three positions of examination region or periphery, city, place, realization effectively covers examination district and possible radio cheating signal emitting-source, localization process machine can be placed in optional position, three localization machine are by 3G wireless data link and localization process interconnect plane, realize information interaction, localization process machine uses 3G wireless data link or wired ethernet and other to disturb transmitter networking, to external jamming transmitter, send and disturb instruction.Spectrum monitoring and cheating signal detection discovery feature are completed by localization process machine, its basic principle and implementation procedure are: monitoring aerial receives omnidirectional, wide band radio signal, by radio frequency line, be input to monitoring receiver, receiver carries out the amplification of radio frequency low noise to the signal of designated frequency range under the control of master controller, bandpass filtering, use local oscillator and frequency mixer that radiofrequency signal is down-converted to intermediate frequency, carry out again intermediate frequency filtering and amplification, the analog if signal in output broadband is to A/D and digital signal panel, signal-processing board carries out A/D conversion to analog signal, FFT conversion and DDC, finally the spectrum information of signal is passed to and in master controller, carried out further spectrum analysis by PC104+ bus, signal identification and processing, abnormal signal is analyzed to judgement, screen and confirm to cheat at one's exam signal.Due to development and design the broadband receiver of speed ability excellence (intermediate-frequency bandwidth reaches 20-25MHz, tuning stabilization time≤1ms, sweep speed >=10GHz/s) and digital signal processing appts, and frequency spectrum and signal processing algorithm are optimized, improved significantly monitoring sweep speed and signal screening judgement, reached the utmost point in the short time (≤300ms) detect and identify the requirement of system design of cheating numeric messaging signal.Time difference positioning function has been combined by localization machine and localization process machine, and system has adopted poor location (TDOA) principle realization time of advent to position the signal emitting-source that cheats at one's exam.The time of advent, poor location claimed again hyperbola (or hyperboloid) positioning mode, mainly by processing the data of the time of arrival (toa) that three or more measuring stations gather, radiation source to be positioned, in two dimensional surface, the time of advent of emitter Signals to two measuring station is poor, has determined that take the hyperbola (line at two stations is called baseline) that two measuring stations are focus.If utilize three stations to form two hyperbola baselines, can obtain so two hyp intersection points, recycling direction finding message is got rid of the imaginary point of baseline opposite side, just the position of radiation source (not containing elevation information) can be decided.In native system, localization machine realize that tuning reception, FFT conversion, DDC (obtaining the I/Q data of signal), time synchronized stamp to drafting the signal of position identifies and by information to functions such as processor transmission; Localization process machine receives the I/Q data from three localization machine, the correlation computations of the frequency-domain and time-domain data by signal that each localization machine is gathered obtains the time of advent difference of three stations between between two, pass through again location Calculation and error correction, positional information that just can picked up signal source.The time synchronizing method of time difference location of the present invention has adopted GPS (Global Position System) (GPS) to realize, and time marking is recorded in I/Q data.GPS location receiver is used to localization machine and localization process machine that its service position information and signals collecting temporal information are provided, and it is needed that these positions and temporal information are that localization process machine carries out signal correction calculating, time difference location Calculation and position error corrected Calculation.Doubtful cheating signal is found and is detected in localization process machine high-velocity scanning detecting, sends the instruction that gathers locating information by 3G wireless router to localization machine, and other jamming equipment that simultaneously links carries out interference signal compacting.Localization machine receives after the location work order of localization process machine, the signal of assigned frequency is carried out to tuning reception and I/Q data acquisition, and the time synchronization information of obtaining by GPS location receiver is identified in I/Q data, recycling 3G radio channel sends to localization process machine by I/Q data, by processor pair, it carries out computing, obtains the source position information of cheating signal.
These are only preferred embodiments of the present utility model, not in order to limit the utility model, all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., all should be included in protection range of the present utility model.
Claims (4)
1. can detect and the cheat at one's exam system of numeric messaging signal of positioned radio electricity for one kind, it is characterized in that: comprise at least three localization machine and localization process machine, three described localization machine adopt wireless telecommunications to be connected with described localization process machine, described localization process machine comprises master controller, local storage, monitoring aerial, monitoring receiver, A/D and digital signal panel, GPS location receiver and wireless communication server, the output of described monitoring aerial is connected with the input of described monitoring receiver, the output of described monitoring receiver is connected with the input of described A/D and digital signal panel, the data output end of described A/D and digital signal panel is connected with the data input pin of described master controller, the FPDP of described local storage is connected with the FPDP of described master controller, the output of described master controller is connected with the input of portable aobvious control terminal, the output of described GPS location receiver is connected with the input of described master controller, described master controller is connected with described wireless communication server.
According to claim 1 a kind of can detecting and the cheat at one's exam system of numeric messaging signal of positioned radio electricity, it is characterized in that: described localization machine is identical with the hardware configuration of described localization process machine.
According to claim 1 a kind of can detecting and the cheat at one's exam system of numeric messaging signal of positioned radio electricity, it is characterized in that: described monitoring aerial is bored reception antenna for dish.
According to claim 1 a kind of can detecting and the cheat at one's exam system of numeric messaging signal of positioned radio electricity, it is characterized in that: described wireless communication server is 3G wireless router.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201320550522.XU CN203446031U (en) | 2013-09-05 | 2013-09-05 | System capable of detecting and positioning radio exam cheating digital message signal |
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| CN201320550522.XU CN203446031U (en) | 2013-09-05 | 2013-09-05 | System capable of detecting and positioning radio exam cheating digital message signal |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986537A (en) * | 2014-05-30 | 2014-08-13 | 成都佳发安泰科技股份有限公司 | Method for comprehensively evaluating examination room cheating signal suspected degree |
| CN106406751A (en) * | 2016-06-03 | 2017-02-15 | 中北大学 | High-speed large-capacity I/Q data recorder based on multi-channel LVDS interface |
| CN106950539A (en) * | 2017-03-03 | 2017-07-14 | 长沙理工大学 | The anti-GPS tracking modules positioning identifying method of high accuracy based on time difference method |
-
2013
- 2013-09-05 CN CN201320550522.XU patent/CN203446031U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103986537A (en) * | 2014-05-30 | 2014-08-13 | 成都佳发安泰科技股份有限公司 | Method for comprehensively evaluating examination room cheating signal suspected degree |
| CN103986537B (en) * | 2014-05-30 | 2016-03-23 | 成都佳发安泰科技股份有限公司 | Examination hall cheating signal Suspected Degree integrated evaluating method |
| CN106406751A (en) * | 2016-06-03 | 2017-02-15 | 中北大学 | High-speed large-capacity I/Q data recorder based on multi-channel LVDS interface |
| CN106406751B (en) * | 2016-06-03 | 2018-10-30 | 中北大学 | High-speed high capacity I/Q data loggers based on multichannel LVDS interface |
| CN106950539A (en) * | 2017-03-03 | 2017-07-14 | 长沙理工大学 | The anti-GPS tracking modules positioning identifying method of high accuracy based on time difference method |
| CN106950539B (en) * | 2017-03-03 | 2020-05-12 | 长沙理工大学 | High-precision anti-GPS tracking module positioning identification method based on time difference method |
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Granted publication date: 20140219 |